The Colorado Department of Trasportation is going to line the I-70 twin tunnels, near Idaho Springs with concrete to enhance the tunnels' strength and longevity. Watch the video below explaining the details of the project and see pictures of the unlined tunnel's interior!
London's Crossrail, the most significant infrastructure project currently in the U.K. aims to improve commuting services across London, alleviate congestion and completely modify traveling around the capital.
A very important landmark of Washington DC lies under its ground and remains unknown to many of the nation's capital residents. The Dupont circle tunnels one of the most important landmarks of the city remain closed to the public for over 50 years. Watch the video below for a breathtaking underground view!
TBM Evelyn has set a new project record at National Grid's London Power Tunnels project, digging 55.2 meters in a single 12-hour shift! The tunnel is part of a £250m project, aiming in providing new underground infrastructure for electricity transmission.
What most commuters of Amtrak trains crossing the Hudson River do not have the opportunity to see, was witnessed by U.S. Senator Cory Booker and Amtrak officials. View of the damaged from hurricane Sandy 105-year old rail tunnels was recorded on video, showing the spalling and corrosion on the concrete bench walls. It is estimated that the tunnels have about 20 years of life, before they are shut down for repair works. Replacement of the tunnels is also examined by officials, with total cost being estimated at $20 billion.
On June 1st, the Gotthard Base Tunnel was officially opened, making it the longest and deepest tunnel. Nearly 20 years after work began, the tunnel connects Erstfeld to Bodio, Switzerland before continuing south. The tunnel itself will be traversed in only 20 minutes with rail speeds up to 250 km per hour (155 mph) and will shave an hour off of the travel time from Zurich, Switzerland to Milan, Italy compared to the old route.
Completion of the new Highway 99 tunnel, originally planned for late 2015, has been delayed even further, possibly until 2019. It is now estimated that the project will be over budget by $223 million. Unfortunately, it may be the taxpayers who end up paying the cost through Washington state's gas tax, tolls, and increased debt of the state transportation fund.
When finished, the tunnel will stretch 1.7 miles and span 4 lanes of traffic. It is being built to replace the outdated viaduct which could be seriously compromised in the event of seismic activity. The total estimated cost of the project has now reached $3.374 billion.
The tunnel is being excavated using Bertha, a 57-foot diameter tunnel boring machine. A large portion of the delay was caused by Bertha breaking down approximately one third of the way through the boring distance. The machine sat idle for over two years as workers had to excavate down near Pioneer Square to repair it after a major malfunction. The prime contractor, Seattle Tunnel Partners (STP), blames an 8-inch steel pipe left over from state groundwater testing for the breakdown, however the state believes this is unlikely. Now that it has been repaired, Bertha is tunneling at a rate of 40 feet per day.